ATAM862 datasheet(65/110 Pages) ATMEL

65 / 110 page

4554E–4BMCU–05/06

ATAM862-3

23.3.6

Timer 3 – Mode 11: Biphase Demodulation

In the Biphase demodulation mode, the timer operates like in Manchester demodulation mode.

The difference is that the bits are decoded via a toggle flip-flop. This flip-flop samples the edge in

the middle of the bitframe and the compare register 1 match event shifts the toggle flip-flop out-

put into shift register (see “Combination Mode 9: Biphase Demodulation” on page 90).

Figure 23-11. Biphase Demodulation

23.3.7

Timer 3 – Mode 12: Timer/Counter with External Capture Mode (T3I)

The counter is driven by an internal clock source and an edge at the external input T3I loads the

counter value into the capture register. The edge can be selected with the programmable edge

detector of the timer input stage. This mode can be used for signal and pulse measurements.

Figure 23-12. External Capture Mode

BIT 0

BIT 1

BIT 2

BIT 3

BIT 4

BIT 5

BIT 6

Synchronize

Biphase demodulation mode

Timer 3

mode

T3EX

Q1=SI

CM31=SCI

SR-DATA

T3I

Reset

Counter 3

01 2 3 456789 1011

Counter 3

T3CP-

T3I

T3R

Capture value = X

Capture value = 17

Capture

value = 35

121314 16

171819

21 23

242526

28 30

313233

35 37

383940

ATAM862 Datasheet(PDF) 65 Page - ATMEL Corporation

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